Now best known as screenwriter and executive director of Alexander Korda's London Films, Lajos Biró was a journalist and political secretary in Budapest before fleeing to Vienna following the 1918 October Revolution.

In Vienna, he began his 23-film collaboration with Korda by writing the screenplay for a version of The Prince and the Pauper (Prinz und Bettelknabe, Austria, d. Alexander Korda, 1920); and became a popular author and playwright there before going to Hollywood in 1924 to sell his play, The Czarina, to Ernst Lubitsch.

In 1932, he moved to England, where he worked on three screenplays for Gainsborough, then either wrote the stories or collaborated on the screenplays of most of Korda's films and became his closest friend. Biró was a major influence in the international success of London Films that began with The Private Life of Henry VIII (d. Alexander Korda, 1933) for which he wrote the story.